A network of common pyroelectric motion sensors that can track and identify human targets has been developed using low-cost, commercially available components. Significantly cheaper than deploying infrared imag- ing systems and considerably more advanced than typical motion sensing systems, this system consists of a small number of sensor nodes distributed across a medium sized room. Each node contain up to eight pyroelectric detectors and provides limited computation and communication capabil- ities. These detectors use structured lenslets to extract frequency com- ponents of targets for classification and the location and orientation of the sensors is used to track targets as they move through the space. This system has demonstrated multiple target tracking and the ability to dif- ferentiate between multiple people. © 2005 OSA/OSHS 2005.